I tried some fiber glass work for gear doors on my Giant
P-51 a few years ago. I enjoyed it a lot more than I thought
I would. I have just purchased a sheet of blue siding foam to
make some cowls. Do a little research here & you will find
plenty of info. the nice thing about FG is that it's cheap to
work with. If you screw one up just do it again.
Good Luck!

Johnny C!